/adv/, how to feel more confident about my appearance and learn

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/adv/, how to feel more confident about my appearance and learn to love myself? Everyone seems to think my sister's much more beautiful than me, even though without makeup we look pretty much the same. My sister has a new boyfriend/fuckbuddy now too and when we all hang out, he keeps insulting my appearance as a joke, saying things like "you're old and worn-out" and "you don't look nice like women should". He makes it clear that he's joking, but still stings. He has liked my pics in twitter though, so I dunno. Anyways it makes me feel like shit when my sister tells me that women can use their appearance to their advantage and I've just never been able to. Not that I'd want to, either (I'm too prideful and don't want to be even a little bit objectified) but it still stings that everyone thinks I'm "the ugly one".

I know this a completely stupid worry blown way out of proportion. I fear it's affecting my relationship even when I keep asking my boyfriend why my sister is more beautiful than me. I really don't want to be this shallow idiot that I am. I need someone to slap some sense into me.

Pic unrelated, it's not me.